C++菜鸟问题

Question

#include <iostream>
using namespace std;
int main()
{
float score;
char grade;
cout<<"Please enter a score: ";
cin>>score;
if(score>100||score<0)
{
cout<<"Sorry,you have a wrong number,please enter again!"<<endl;
cout<<"Please enter a score: ";
cin>>score;
}
switch(int(score/10))
{
case10:
case 9:grade='A';break;
case 8:grade='B';break;
case 7:grade='C';break;
case 6:grade='D';break;
default:grade='E';
}
cout<<"Score is "<<score<<",grade is "<<grade<<endl;
return 0;
}
为什么输入100，运行结果出错，好像其他都正常

Answer 1

因为您漏了个空格。

case10:

不是case标签，而是标号（所以语法没错，编译通过了，但程序有逻辑漏洞）。

改成

case 10:

Answer 2

case10:

分开
case 10:

Answer 3

把上面的float score换成int score看看。

Answer 4

case和10之间要加空格

Answer 5

你好像把case 和10连在一起了？